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Re: Don does use AC on 45 based amps

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Todd Krieger

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In Reply to: Don does use AC on 45 based amps posted by 2chJunkie on November 11, 2006 at 10:17:33:

I'll talk to Don tomorrow. I thought he said he uses DC on the filaments, but my memory could be wrong.
I also want to say I'm trying out some Fritz Hemptone tower speakers, which utilize those new hemp full-range drivers. Mated with the Don Allen modified Sansui receiver and Cakepan amp, I've may have struck sonic gold.... It's one of those rare occasions where I could sense the plaster in the concert hall, the booze on a singer's breath, the complex harmonic richness of a piano, the wooden body resonance of an acoustic guitar, the hair-raising complexity and precision of a world-class drummer, and the massed sound of acoustic instruments of a symphony orchestra..... (No, it does not sound as good as the Who concert.)

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Re: Don does use AC on 45 based amps - woodelf 11:24:09 12/04/06 (0)
I like my banana fiber speakers better --- I use fostex speakers
and 6B4G's. I had to use simple DC on my SET amp -- the 6B4G's
humm way to much on AC. From what I have seen on the net, every
body sugests constant current sounds better than DC heating.
If I had rebuild my amp I am thinking of simple transistor/9.1 volt
zener ,regulator for 8.4 volts @ 1.1 amps and have a 2 1 ohm resitors
give me pesudo constant current to my 6B4G's. ( Note that is
6.2 volts @ 1 amp but still with in ratings of the tube )
I use about 60 MA but have a 3.4K output transformer, rather than
say a 2.5K one.
Re: Don does use AC on 45 based amps - AZ_Gary 07:49:32 11/12/06 (3)
Todd,
What mods did Don do on your Sansui? Which model?
Gary

Vinyl and Film Forever
- Re: Don does use AC on 45 based amps - Todd Krieger 12:53:17 11/12/06 (2)
  It was the same unit he was using for a while- A Sansui TA-300. He got another unit and sold his to me. I spent about six months waiting for one to show up on eBay, and the one time it came up, I got "out-sniped". (I was one of two people who "snipe bid" on the unit, right at the end of the auction, but the other guy bid higher than I did.) Then Don offered me his unit when he got another TA-300 to work on. He told me he could do other models, and maybe Harman/Kardon units as well. I think the TA-300 has the same tuner as the TU-717.
  Don disabled the stock line stage and power amp sections of the unit, and put in the same line stage he uses in his dedicated line stage, transforming the solid-state receiver to a tube (actully hybrid) tuner-preamp. So all it would need is a power amp, and it's good to go. I got the unit because it's nice to have a good tuner and great line stage in one convenient package.
  - Re: Don does use AC on 45 based amps - AZ_Gary 18:19:12 11/12/06 (1)
    Thanks, Todd.
    Gary
    
    Vinyl and Film Forever
    - Some AC, Some DC.... - Todd Krieger 21:06:34 11/12/06 (0)
      I did speak to him today. The filament supply depends on the individual unit. My particular amp was converted to DC filaments when Don transformed the amp from a 300B amp to a 45 amp. Don also told me he's not certain that DC filaments degrade sound.

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